NF EN ISO 4624, T30-062 (06/2023)

This document specifies three methods for determining adhesion by a tensile test on a single coat or on a multi-coat system of paints, varnishes or similar products. These methods include: — method A: using two pads and suitable for testing both rigid and deformable substrates; — method B: test on a single side, using a pad, suitable only for rigid substrates; — method C: using blocks, one of which is used as a painted substrate. These test methods have proven useful in comparing the adhesion of various layers. They are most useful for providing relative classifications for a series of coated panels with significant differences in adhesion. The test can be carried out on a wide variety of substrates. Different operating modes are presented depending on whether the substrate is deformable, for example thin metal, plastics and wood, or rigid, for example concrete plates or thick metal. To avoid deformation of the substrate during the tensile test, it is common to use a sandwich assembly. For example, for special needs, the coating can be applied directly to a test pad.
(Automatic translation from French)